Fast-forward merge requests

Retain a linear Git history and a way to accept merge requests without
creating merge commits.

Overview

When the fast-forward merge (--ff-only) setting is enabled, no merge
commits will be created and all merges are fast-forwarded, which means that
merging is only allowed if the branch could be fast-forwarded.

When a fast-forward merge is not possible, the user is given the option to rebase.

Use cases

Sometimes, a workflow policy might mandate a clean commit history without
merge commits. In such cases, the fast-forward merge is the perfect candidate.

Enabling fast-forward merges

Navigate to your project's Settings and search for the 'Merge method'

Select the Fast-forward merge option

Hit Save changes for the changes to take effect

Now, when you visit the merge request page, you will be able to accept it
only if a fast-forward merge is possible.

If the target branch is ahead of the source branch, you need to rebase the
source branch locally before you will be able to do a fast-forward merge.